GB1528755A - Method and apparatus for initial synchronization of ground stations in message transmission via a telecommunication satellite - Google Patents
Method and apparatus for initial synchronization of ground stations in message transmission via a telecommunication satelliteInfo
- Publication number
- GB1528755A GB1528755A GB3936775A GB3936775A GB1528755A GB 1528755 A GB1528755 A GB 1528755A GB 3936775 A GB3936775 A GB 3936775A GB 3936775 A GB3936775 A GB 3936775A GB 1528755 A GB1528755 A GB 1528755A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frame intervals
- frame
- given
- time window
- station
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/204—Multiple access
- H04B7/2046—SS-TDMA, TDMA satellite switching
- H04B7/2048—Frame structure, synchronisation or frame acquisition in SS-TDMA systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Relay Systems (AREA)
Abstract
1528755 Synchronizing LICENTIA PATENT VERWALTUNGS GmbH 25 Sept 1975 [26 Sept 1974] 39367/75 Heading H4M In a t.d.m. system, in which ground stations are in TDMA communication by means of the transponder of a spot-beam aerial system satellite, t.d.m. frames containing channels allocated to the stations, to establish initial synchronization for a given ground station, the latter transmits a pseudonoise PN sequence periodically at the frame frequency, and at reduced level with respect to the established transmissions, the signal being returned to the station by the satellite transponder during a time window for each frame, the value at each given bit position for the N bits received during each time window, being summed over a plurality of frame intervals, the summed signals being used in a comparison process to establish synchronization for the given station. A summing arrangement may be provided for each of the N bit positions occurring during a time window, all such arrangements operating in parallel to sum the individual given bit values over k frame intervals, Fig. 2 (not shown), or a single summing arrangement may sum the first such bits only, for k frame intervals, followed by the 2nd . . .Nth bits of the N bit sequence over succeeding k frame intervals, the signal for comparison thus being derived in N.k frame intervals.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19742445883 DE2445883B2 (en) | 1974-09-26 | 1974-09-26 | PROCEDURE AND CIRCUIT ARRANGEMENT FOR THE INITIAL SYNCHRONIZATION OF THE GROUND STATIONS DURING THE TRANSMISSION OF MESSAGES VIA A REMOTE COMMUNICATION SATELLITE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1528755A true GB1528755A (en) | 1978-10-18 |
Family
ID=5926735
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3936775A Expired GB1528755A (en) | 1974-09-26 | 1975-09-25 | Method and apparatus for initial synchronization of ground stations in message transmission via a telecommunication satellite |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE2445883B2 (en) |
| FR (1) | FR2286561A1 (en) |
| GB (1) | GB1528755A (en) |
| IT (1) | IT1042351B (en) |
-
1974
- 1974-09-26 DE DE19742445883 patent/DE2445883B2/en active Granted
-
1975
- 1975-09-08 IT IT2699675A patent/IT1042351B/en active
- 1975-09-25 FR FR7529446A patent/FR2286561A1/en not_active Withdrawn
- 1975-09-25 GB GB3936775A patent/GB1528755A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2445883B2 (en) | 1976-11-04 |
| IT1042351B (en) | 1980-01-30 |
| DE2445883A1 (en) | 1976-04-01 |
| FR2286561A1 (en) | 1976-04-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |